JP2009210038A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing capable of inhibiting separation of a split ring constituting one of the rolling bearing raceway rings without increasing the number of component parts assembled. <P>SOLUTION: The rolling bearing in the form of a four-point contacting ball bearing has an inner 1 and an outer ring 2 as raceway rings each furnished with two shoulders and is structured so that the inner ring 1 is embodied as an assembled raceway ring and inhibition of separation of two segments 5a and 5b constituting the inner ring 1 is formed by engagement parts 10a and 10b provided at a retainer 8 and engagement parts 9a and 9b provided at the segments 5a and 5b. The parts 10a and 10b of the retainer 8 are formed as a cone-shaped projection protruding toward the inner ring 1 while the parts 9a and 9b of the segments 5a and 5b are formed as walls of circumferential grooves formed in their respective single shoulders 7a and 7b over the whole stretch of the circumference, and when the segments 5a and 5b are approached to each other in the condition that the outer ring 2, the retainer 8 for accommodating rolling elements 3 in pockets 13 free of slipoff stopper, and the segments 5a and 5b are arranged concentrically with the bearing axis directed vertically, the engagement parts 10a and 10b are pushed back by single shoulders 7a and 7b resiliently so as to be caught in the engagement parts 10a and 10b on the retainer 8 side in the axial direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling bearing provided with inner and outer rings and a cage, and more particularly to a bearing provided with inner and outer rings that receive rolling elements from both sides in the axial direction.

There are various methods for assembling the rolling bearing depending on the type of the bearing ring, the presence or absence of the cage, and the form.
For example, when the inner and outer rings are track rings in which rolling elements cannot be incorporated in the axial direction, such as bearing rings with both shoulders or flanges, the inner ring is eccentric to the outer ring and the rolling elements are placed between the inner and outer rings. Create a gap that can be arranged in the circumferential direction around the axis, place the inner ring concentrically with the outer ring with a predetermined number of rolling elements inserted in the gap, and then butt the alignment cage, A typical assembly method is to push the cage and put a predetermined number of rolling elements into the pocket of the cage. This assembling method has a limit in the gap between the inner and outer rings obtained by the eccentricity of the inner ring, and the number of rolling elements is limited.

  Therefore, there are some in which one of the inner and outer rings is divided into two in the axial direction, such as a four-point contact ball bearing and an NUP type or NH type cylindrical roller bearing. Each of the two split wheels has a shoulder and a heel, and it is possible to contact the raceway surface by sandwiching the rolling elements in the respective pockets of the cage from both sides in the axial direction. ing. In this type of rolling bearing, the other bearing ring of the inner and outer rings, the cage, and the two split rings are arranged concentrically, and the rolling elements placed in each pocket are sandwiched between the two split rings from both sides in the axial direction. The number of rolling elements is not limited by the amount of eccentricity of the inner ring, and the number of rolling elements can be increased.

  Instead, in this type of rolling bearing, it is necessary to position the two split wheels so that the rolling elements do not fall off. In a state where the rolling bearing is assembled between the housing and the shaft, the above-mentioned positioning is naturally performed because the two split rings are fixed from both sides in the axial direction by the shoulder of the housing, the bearing nut and the like. Therefore, the positioning is required after the assembly of the bearing is completed and until it is assembled between the housing and the shaft. The axial displacement of the two split wheels in the radial direction and the center side of the bearing width can be appropriately limited by contact with the rolling elements. Therefore, a separation preventing means is provided so that contact restriction between the two split wheels and the rolling element can be obtained.

  Conventionally, as a rolling bearing having the above-described separation preventing means, one of the race rings is divided into two by a radial plane passing through the center of the raceway surface width, and the circumference is arranged on the radial surface on the side fitted to the housing or shaft of each split ring. A groove is formed, and a split ring is inserted into each circumferential groove in a state where the rolling element is sandwiched from both sides in the axial direction by two split rings, so that the two split rings are prevented from being separated 4 There is a point contact ball bearing (Patent Document 1).

JP 2003-172342 A

  However, when the snap ring is used to prevent separation as in the rolling bearing disclosed in Patent Document 1, the number of assembly parts of the rolling bearing increases. In addition, since one of the race rings has a snap ring attached to a radial surface on the side where the bearing ring is fitted to the housing or the shaft, there is a possibility that the snap ring and the housing or the shaft interfere when the fitting to the housing or the shaft is performed. There is.

  In view of the above circumstances, an object of the present invention is to separate and stop two split rings constituting one of the bearing rings of a rolling bearing without increasing the number of assembly parts.

The present invention that achieves the above object includes an inner ring, an outer ring, and a plurality of rolling elements interposed between raceway surfaces of the inner and outer rings and held by a cage, and one of the inner and outer rings is in a pocket of the cage. It is assumed that the rolling bearing is composed of two split wheels that are brought into contact with the raceway surface while sandwiching the inserted rolling elements from both sides in the axial direction, and the two split rings are separated and stopped so that the rolling elements do not fall off.
This is because the number of rolling elements in the rolling element set is increased as described above.

  According to the present invention, based on the above premise, the two split wheels are engaged with the retainer in the axial direction to be separated and stopped, and an engagement portion that can be engaged with the retainer is provided, and can be engaged with the split wheel. A structure provided with a simple engaging portion is adopted. In the present invention, the “axial direction” refers to the bearing central axis direction.

  Specifically, considering the assembly state of the rolling bearing, the rolling elements in each pocket of the cage are positioned on both sides in the axial direction by the other raceway of the inner and outer rings, so the cage is positioned in the axial direction. Has been. Therefore, if the two split wheels are engaged with the cage, the two split wheels can be separated and stopped using the positioning of the cage. For this engagement, if an engaging portion that can be engaged with the cage is provided and an engaging portion that can be engaged with the split ring is provided, the number of assembly parts does not increase.

  If the configuration in which the engaging portion of the split ring is formed on the radial surface facing the cage and the engaging portion of the cage is formed on the radial surface facing the one race ring is adopted, When the is engaged with the housing or the shaft, the engaging portion of the split ring and the engaging portion of the cage do not interfere with the housing or the shaft.

  Various configurations can be adopted as the configuration in which the engaging portion of the cage and the engaging portion of the split ring are engaged in the axial direction.

  For example, the engaging portion of the cage is formed in a protruding piece shape protruding in the axial direction, and the engaging portion of the cage is plastically bent toward the dividing wheel while the rolling element is sandwiched between the two dividing wheels. Thus, it can be configured to be hooked in the axial direction on the engaging portion formed on one side surface in the axial direction on the split wheel side.

Further, one of the engaging portion of the cage and the engaging portion of the split ring is a convex portion, and the other is formed such that the convex portion is hooked in the axial direction, and the split ring is attached to the rolling element. After the one engaging portion is pushed away by the counterpart component while approaching from one side in the axial direction, the other engaging portion can be hooked by elastic recovery.
According to this configuration, the mating part on which the other engaging portion is formed has a portion in which the convex portion which is one engaging portion is hooked in the axial direction, so that the cage and the split ring are arranged concentrically. The wall portion that contacts the convex portion is provided while the split ring is approached from one side in the axial direction of the rolling element. For this reason, a convex part can be pressed on the other party part using the movement of the above-mentioned division wheel. If one of the engaging portions is pushed away by the mating part by using the pressing, and is hooked on the other engaging portion by elastic recovery, the separation stopper is naturally obtained. For this reason, unlike the plastic bending, the engaging portion of the cage is not separately processed in a state where the rolling element is sandwiched between the two split wheels, and the assembly is not complicated.

  More preferably, the engaging portion of the cage is the convex portion, a tapered surface is formed on one side surface in the axial direction of the convex portion, and the split ring is pressed against the tapered surface, whereby the cage is reduced in diameter. If it is configured to generate a component force in a direction away from the direction, a convex portion is formed on the cage side having a relatively low rigidity, and the split ring is axially formed on a tapered surface formed on one side surface of the convex portion in the axial direction. Can be pressed against. Since the component force in the direction of moving the cage away from the split ring in the radial direction is generated by pressing against the tapered surface, the convex portion can be easily pushed away.

Further, if the configuration in which the one engaging portion is partially formed in the circumferential direction around the axis and the other engaging portion is formed over the entire circumference is adopted, the convex portion is pivoted. Compared to the configuration formed over the entire circumference in the circumferential direction, the convex portion is partially formed in the circumferential direction, so that the deformability of the convex portion when pressing the split ring is increased. The deformation of the two split rings can be avoided. It is preferable to avoid as much as possible the deformation of the two split wheels forming the raceway surface.
If the concave portion is formed over the entire circumference in the circumferential direction, even if the convex portion is partial in the circumferential direction, the relative rotation of the split ring and the cage after the bearing is assembled and before the bearing is assembled. Even so, the engagement is not released, and separation of the two split wheels is secured. For this reason, it is not necessary to stop the retainer and the two split wheels with separate members.

  For example, when the engaging portion of the cage is the convex portion and the engaging portion of the split ring is formed over the entire circumference, the fixed reference surface formed on the side surface of the split ring can be used, It can be a groove wall or a diameter difference portion of a circumferential groove formed on a radial surface facing the cage. When the engaging portion of the split ring is a convex portion formed on the radial surface facing the cage, and the engaging portion of the cage is formed over the entire circumference, the split ring of the annular portion of the cage It can be a groove wall or a diameter difference portion of a circumferential groove formed on the diameter surface facing the surface.

  When the convex portion is partially formed in the circumferential direction, the other engaging portion is a concave portion that is partially formed in the circumferential direction, and the convex portion enters the concave portion, thereby preventing the separation. At the same time, it is possible to configure so as to obtain the above-mentioned detent. When this configuration is adopted, it is necessary to align the circumferential direction with the cage when bringing the split wheel close to the rolling element, but when the other engaging portion is formed over the entire circumference in the circumferential direction as described above, This is preferable in that such alignment is unnecessary.

  As a material for forming the cage, brass alloy, steel, synthetic resin, or the like can be used. For example, when adopting a configuration in which the engaging portion of the cage is plastic bent, it can be made of a steel plate or a brass alloy. Moreover, when making the engaging part of the said cage into the said convex part, it is preferable to make it from the synthetic resin which is easy to obtain elastic deformation rather than the product made from a brass alloy or steel.

Examples of the two split rings constituting one of the race rings of the inner and outer rings include, for example, two annular parts constituting a mating race of a four-point contact ball bearing, a collar ring in a roller bearing and a split ring with a single collar. Can be mentioned.
Examples of the other raceway of the inner and outer rings include a non-separable raceway with both shoulders and a non-separate raceway with both collars. If the other raceway is a non-separable raceway, the rolling elements are positioned on both sides in the axial direction when the engaging portions on both sides are elastically deformed or during shipment. Directional positioning can be obtained.

As the cage, a cage type which is a kind of integral cage can be adopted. The cage retainer is formed by dividing a space between two annular portions by a pillar portion into each pocket. In order to position the rolling elements in the respective pockets of the cage on the other side of the cage, if the cage type cage is used, the rolling elements are placed in the pockets before the rolling elements are sandwiched between the two split rings. It is necessary to put in. This operation is performed with each pocket facing the raceway surface of the other raceway ring. Thereafter, the rolling element is sandwiched between the two split wheels from both sides in the axial direction. It is necessary to prevent the rolling elements in each pocket from falling off until the rolling elements are completely sandwiched between the two split wheels. For this reason, it is conceivable to use a cage-type cage with a retaining portion that prevents the rolling element from falling off from the pocket opening on the one raceway side. This retaining portion generally comprises a claw-like or conical throttle portion formed at the opening edge of one of the raceways of each pocket, so that the rolling element is pushed into the pocket between the retaining portions.
The use of the cage-type cage with the retaining portion is excellent in that there is no fear that the rolling element will fall out of the pocket when the rolling element is sandwiched between the two split wheels from both sides in the axial direction.

Instead of adopting the retainer with the retaining portion, the retainer is a raceway guide system using the other raceway of the inner and outer rings, and the rolling element is pulled out to the one raceway side. A cage shape without a portion to be stopped, the other raceway of the inner and outer rings is arranged so that the central axis thereof is directed vertically, and the cage is concentric with the other raceway, and With the respective pockets arranged so as to face the raceway surface of the other raceway ring, the rolling element placed in each pocket is received by the raceway surface of the other raceway ring and the lower annular portion of the cage. The two split rings are concentric with the cage and arranged above and below the rolling elements in the pockets, and the split rings are relatively close to each other. Before the one engaging part comes into contact with the mating part, Can be split wheel is configured so as to approach to a position where it does not fall off of the rolling elements.
Here, with the above-described bearing ring guide system, since the radial direction guidance of the cage is performed depending on the raceway ring, a cage guide surface for guiding the annular portion of the cage in the radial direction is formed on the inner ring or the outer ring, A configuration in which a radial cage clearance is set between an annular portion of the cage and a cage guide surface.
As in this configuration, if the cage has a cage shape that does not have a portion that prevents the rolling elements in each pocket from being pulled out to the one raceway side, the rolling elements can be press-fitted into each pocket. There is no burden on the operator.
The other race ring is arranged so that its central axis is directed in the vertical direction, the cage is concentric with the other race ring, and each pocket faces the raceway surface of the other race ring. If the rolling elements placed in each pocket are received by the raceway surface of the other raceway ring and the lower annular part of the cage and stay in the pocket, the cage will come out of the cage. Even if there is no stop, the rolling elements placed in each pocket do not fall off due to their own weight on one side of the race, and can be sandwiched between the two split wheels from both sides in the axial direction.
That is, when the two split rings are arranged concentrically with the cage and above and below the rolling elements placed in the pockets, and when the split rings are brought relatively close to each other, the one engaging portion is opposed to the counterpart. If the split rings approach the position where the rolling elements do not pass before coming into contact with the side parts, when the impact occurs due to the contact between the convex part and the counterpart part, the two split rings There is no worry that the rolling element will fall out.
Therefore, according to this configuration, the bearing assembly can be performed by sandwiching the rolling element between the two split wheels while reducing the burden on the operator of putting the rolling element using the cage retainer without the retaining portion. .

As described above, if the rolling bearing is assembled between the housing and the shaft, the two split wheels are fixed from both sides in the axial direction, so that the both engaging portions do not need to function after being assembled.
Therefore, when it is desired to avoid contact between the engaging part of the cage and the engaging part of the split ring during the operation of the bearing, and to eliminate the risk of intrusion of these frictional powders and fragments, It is conceivable to cut or delete parts.

  Preferably, the engaging portion of the cage and the engaging portion of the split ring are configured to be able to rotate relative to each other in a non-contact manner in a state where the bearing is incorporated, and to engage regardless of the relative rotational position. For example, it is possible to eliminate the risk of the intrusion of the above-mentioned friction powder and the like in the assembled state of the bearing without performing the above-mentioned cutting operation. How is the split ring and the cage between the assembly of the bearing and the assembly of the bearing? Even if the rotation is relative, it is possible to ensure separation of the two split wheels. For this reason, it is not necessary to stop the retainer and the two split wheels with separate members.

  As a configuration for engaging the engaging portion of the cage and the engaging portion of the split wheel regardless of the relative rotational position of each other, at least one of the engaging portions is circumferential in the circumferential direction around the axis. What is necessary is just to form over the perimeter.

More specifically, the cage is a bearing ring guide system, and the cage guide surface of the race ring, the engaging portion of the cage and the split ring are arranged on the same radial plane, and the ring of the cage is The radial guide gap between the cage and the cage guide surface is smaller than the radial gap between the engaging portion of the split ring and the cage engaging portion, and the axial pocket gap of the cage is divided. It can comprise so that it may become smaller than the axial clearance between the engaging part of a ring | wheel and the engaging part of the said holder | retainer.
The bearing ring forming the cage guide surface may be either an inner or outer ring, and the cage guide surface may be formed on the one of the race rings. This is because the two split wheels are fixed by incorporating the bearing.
As in this configuration, if the cage guide surface of the bearing ring, the engagement portion of the cage, and the split ring are arranged on the same radial plane, the engagement portion of the cage is It is located in a region where the positional relationship of directions is most stable.
In such a region, if the guide clearance of the cage is smaller than the radial clearance between the engagement portion of the split ring and the engagement portion of the cage, both engagements are caused by the eccentricity of the cage during normal operation. The part does not contact in the radial direction.
Further, if the pocket clearance in the axial direction of the cage is made smaller than the axial clearance between the engagement portion of the split ring and the engagement portion of the cage, both engagement portions are axially moved during normal operation. There is no contact.

  As described above, according to the present invention, the two split wheels are engaged with the retainer in the axial direction to be separated and stopped, and an engaging portion that can be engaged with the retainer is provided to engage the split wheel. By adopting a configuration in which a possible engaging portion is provided, the two split wheels can be separated and stopped using the positioning of the cage without increasing the number of assembly parts.

Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a half cross-section of the rolling bearing according to the first embodiment cut along an axial plane.
As shown in FIG. 1, the rolling bearing according to the first embodiment is configured as a four-point contact ball bearing. The inner and outer rings 1, 2 are raceways with shoulders for positioning the rolling elements 3, 3,... On both sides in the axial direction. The rolling elements 3, 3... Are made of balls and are determined to a required number. The inner ring 1 is a matching raceway, and is divided into two so that the raceways 3, 3... Can contact the raceway surface 4 from both sides in the axial direction. The outer ring 2 is a non-separable type.

  The two split rings 5a and 5b constituting the inner ring 1 are divided by a radial plane passing through a non-contact region with the rolling element 3 formed at the center of the width of the raceway surface 4, and each one side of the raceway surface 4 is provided. Portions 6a and 6b are formed. The split wheels 5a, 5b have one shoulders 7a, 7b that are in contact with one side in the axial direction of the rolling elements 3, 3,. The split rings 5a, 5b are abutted against the rolling elements 3, 3,... From both sides in the axial direction, whereby the inner ring 1 is configured, and the one side portions 6a, 6b of the raceway surface 4 are 3... Are contacted from one axial side toward the bearing width central side. Each one side part 6a, 6b of the raceway surface 4 comes into contact with the rolling element 3 receiving a pure radial load with a contact angle at one contact point.

  The displacement of the two split wheels 5a, 5b in the radial direction and the center side of the bearing width is limited by the contact between the raceway surface 4 and the rolling elements 3, 3,. Further, the two split wheels 5a, 5b are separated and stopped within a range in which contact restriction with the rolling elements 3, 3,. Specifically, engaging portions 9a and 9b that can be engaged with the split wheels 5a and 5b are provided, and engaging portions 10a and 10b that can be engaged with the cage 8 are provided, and the engaging portions 9a, 9b, 10a and 10b can be hooked to each other in the axial direction, and restrictions are made using these.

Fig.2 (a) has shown the side surface of the holder | retainer which concerns on 1st Embodiment. FIG. 2B is a cross-sectional view of the cage according to the first embodiment taken along the line IIb-IIb in FIG.
As shown in FIGS. 1 and 2, the cage 8 is a cage cage. The annular portions 11a and 11b of the cage 8 are separated by a pillar portion 12, 12... In a circumferential direction around the axis (hereinafter simply referred to as “circumferential direction”), and thus, required. A number of pockets 13, 13... Are formed. The cage 8 does not have a portion for preventing the rolling elements 3 placed in the respective pockets 13 from coming off to the inner ring 1 side and the outer ring 2 side, and can be inserted without pushing the rolling elements 3 into the respective pockets 13. The cage 8 is an integral injection molded product.

  The cage 8 is a raceway guide system using the outer ring 2. Cage guide surfaces 14a and 14b for guiding the annular portions 11a and 11b of the cage 8 in the radial direction are formed on the inner diameter surface of the outer ring 2, and the radial direction is provided between the annular portions 11a and 11b and the cage guide surfaces 14a and 14b. The cage guide clearance is set.

  The engaging portions 9a, 9b on the split ring 5a, 5b side are groove walls of a circumferential groove that passes through the entire circumference in the circumferential direction through the shoulders 7a, 7b of the radial surface facing the cage 8. Yes. The reason why the circumferential groove is used is that the thickness of the shoulders 7a and 7b of the split wheels 5a and 5b can be reduced compared to the case where the diameter difference portion is formed by the outer diameter large diameter portion and the small diameter portion.

  The engaging portions 10a and 10b on the cage 8 side are convex portions that partially protrude in the circumferential direction on the radial surfaces of the annular portions 11a and 11b facing the inner ring 1. These engaging portions 10a and 10b are formed in two places arranged in the circumferential direction of 180 °, and have a weight shape with the tip directed toward the inner ring 1 side.

FIG. 3A shows a cross-section of the assembly process constituting the inner ring 1 of the first embodiment, cut along an axial plane passing through the diameters of the inner and outer rings 1 and 2 and the cage 8, and the axial direction is shown as the vertical direction. ing.
As shown in FIG. 3 (a), each pocket 13 of the cage 8 faces the raceway surface 15 of the outer ring 2, and the outer ring 2 and the cage 8 are horizontally supported in a posture in which the axial direction is directed vertically. In this state, the rolling elements 3 placed in the respective pockets 13 are received by the raceway surface 15 of the outer ring 2 and the lower annular portion 11b of the cage 8, and remain in the pockets 13.

  When the two split rings 5a and 5b are placed concentrically with the outer ring 2 and the retainer 8 in the state where the rolling elements 3 are put in the respective pockets 13, they are separated from the upper and lower sides of the rolling elements 3, 3,. Before the rings 5a and 5b come into contact with the engaging portions 10a and 10b on the cage 8 side, the one side portions 6a and 6b of the raceway surface 4 formed on the split wheels 5a and 5b are used for the rolling elements 3, 3,. It is sandwiched from both the top and bottom sides. For this reason, even if the one shoulders 7a and 7b of the split wheels 5a and 5b come into contact with the engaging portions 10a and 10b on the cage 8 side, the rolling elements 3 do not fall off from the pockets 13.

  As shown in the enlarged view of the split ring 5b side as a representative example in FIG. 3B, one axial side surface of the engaging portions 10a, 10b on the cage 8 side has a weight shape with the tip directed toward the inner ring 1 side. A tapered surface is formed. Therefore, when the split wheels 5a and 5b come into contact with the engaging portions 10a and 10b on the cage 8 side, the one side portions 6a and 6b to the shoulders 7a and 7b of the raceway surface 4 of the split wheels 5a and 5b are formed on the tapered surfaces. Is pressed, a component force is generated in a direction in which the annular portions 11a and 11b of the cage 8 are moved away from the split wheels 5a and 5b in the radial direction. As a result, the cage 8 tries to expand the diameter toward the outer ring 2 side, but the diameter expansion deformation is limited by the cage guide surfaces 14a and 14b, and the radial positioning of the cage 8 is maintained, so that the split ring 5a, The axial pressing of the engaging portions 10a and 10b on the 5b and cage 8 side is ensured.

  The axial displacement of the cage 8 caused by the contact between the split rings 5a and 5b and the engaging portions 10a and 10b on the cage 8 side causes the two split wheels 5a and 5b to move toward the cage 8 side simultaneously from both axial sides. This can be prevented by contacting the engaging portions 10a and 10b. Even if there is a time difference, the axial displacement of the cage 8 that causes the rolling elements 3, 3,... To spill out is prevented by the contact between the raceway surface 15 of the outer ring 2 and the rolling elements 3, 3,. There is no problem as long as you can.

When the split wheels 5a and 5b are pressed in the axial direction against the engaging portions 10a and 10b on the cage 8, the engaging portions 10a and 10b on the cage 8 side are partially in the circumferential direction. Due to the protruding weight, elastic deformation easily occurs.
For this reason, even if the deformation of the cage 8 is limited by the cage guide surfaces 14a and 14b, the engaging portions 10a and 10b are pushed away by the split rings 5a and 5b due to their own elastic deformation, and the shoulders 7a, When it passes over 7b and reaches the circumferential groove passing through the shoulders 7a, 7b, it can be caught by the engaging portions 9a, 9b made of the groove wall of the circumferential groove by elastic recovery. Thereafter, as shown in FIG. 1, the split ends of the split wheels 5 a and 5 b are abutted in the axial direction to form the inner ring 1.
In this state, the cage 8 is positioned in the axial direction via the rolling elements 3, 3... That are in contact with the raceway surface 15 of the outer ring 2. The engaging portions 10a and 10b on the cage 8 side can be hooked from the side that restricts separation in the axial direction with respect to the engaging portions 9a and 9b on the split wheels 5a and 5b side. For this reason, the split wheels 5a and 5b are prevented from being separated.

  In addition, in the above-described separation prevention state, the engaging portions 10a and 10b on the cage 8 side are formed at two locations in the circumferential direction of 180 °, so that they are divided and distributed in each half circumferential region in the circumferential direction. Thus, the inclination of the split wheels 5a and 5b with respect to the radial plane can be restricted. Even if the split wheels 5a and 5b try to rotate using the straight line connecting the two engaging portions 10a and 10b as the rotation axis, they cannot rotate because of the rolling elements 3, 3,. Therefore, the engaging portions 10a and 10b on the cage 8 side can regulate the inclination of the split wheels 5a and 5b with respect to the radial plane only at two locations arranged in the circumferential direction of 180 °. The engaging portions 10a and 10b on the cage 8 side regulate the inclination so that the split rings 5a and 5b are inclined with respect to the radial plane and the rolling element 3 does not fall off from the crack between the split rings 5a and 5b. The number of arrangements in the circumferential direction, the length in the circumferential direction, the amount of protrusion in the radial direction, and the like can be appropriately increased or decreased.

  The rolling bearing according to the first embodiment having the above-described configuration includes the split wheels 5a, 10b provided by the engaging portions 10a, 10b provided in the cage 8, and the engaging portions 9a, 9b provided in the split wheels 5a, 5b. Since 5b is separable, the number of assembly parts is not increased.

  Further, in the rolling bearing according to the first embodiment, the engaging portions 9a and 9b on the split ring 5a and 5b side are formed on the radial surface on the cage 8 side, and the engaging portions 10a and 10b on the cage 8 side are formed. 4 is formed on the radial surface on the inner ring 1 side, for example, even if the inner ring 1 shown in FIG. The engaging portions 10a and 10b on the side of the cage 8 are not engaged, and the engaging portions 9a and 9b on the side of the split ring 5a and 5b and the engaging portions 10a and 10b on the side of the cage 8 do not interfere with each other. .

  Further, the rolling bearing according to the first embodiment elastically deforms the engaging portions 10a, 10b on the cage 8 side by utilizing the relative approach of the split rings 5a, 5b, and naturally the split rings 5a, 5b side. Since the engagement portions 9a and 9b can be caught, the assembly of the bearing is not complicated.

  Further, the rolling bearing according to the first embodiment does not drop out of the pocket 13 while reducing the work load of pocketing the rolling element 3 using the cage-shaped cage 8 having no retaining portion. Thus, the rolling elements 3, 3... Can be sandwiched between the two split wheels 5a, 5b from both sides in the axial direction.

  Further, in the rolling bearing according to the first embodiment, the engaging portions 10a, 10b on the cage 8 side are partially formed in the circumferential direction, and the engaging portions 9a, 9b on the split ring 5a, 5b side are circumferentially arranged. Since it is formed over the entire circumference, both the engaging portions 9a, 9b, 10a, 10b regardless of the relative rotational position around the axis of the cage 8 and the split wheels 5a, 5b in the above-described separation stop state. In addition, when the split wheels 5a and 5b are brought relatively close to each other, it is not necessary to match the relative rotational positions of the engaging portions 9a, 9b, 10a and 10b.

  In the above-described separation prevention state, the rolling bearing according to the first embodiment can be incorporated between the housing 21 and the shaft 22 as shown in FIG. For example, both side surfaces in the axial direction of the split ring 5a, which is a fixed reference surface on one side of the inner ring 1, are abutted against the shaft shoulder 23, and side surfaces on both sides in the axial direction of the split wheel 5b, which is a fixed reference surface on the other side of the inner ring 1. Can be fixed by pushing the bearing nut 25 in the axial direction through the spacer ring 24.

As shown in FIG. 4 as an example, the inner and outer rings 1 and 2 are fixed in the state shown in FIG. In this state, the cage guide surfaces 14a and 14b on the outer ring 2 side, the engaging portions 10a and 10b on the cage 8 side, and the split wheels 5a and 5b are arranged on the same radial plane. For this reason, the engaging portions 10a and 10b on the cage 8 side are located in a region where the positional relationship in the radial direction is most stable.
In such a region, the radial guide clearance between the annular portion 11a of the cage 8 and the cage guide surfaces 14a, 14b is the engagement portion 9a, 9b of the split wheels 5a, 5b and the engagement portion on the cage 8 side. It is set smaller than the radial clearance between 10a and 10b. For this reason, during normal operation, due to the eccentricity of the cage 8, the engaging portions 10a, 10b on the cage 8 side and the split wheels 5a, 5b do not contact in the radial direction.
Further, the axial pocket clearance of the cage 8 is set to be smaller than the axial clearance between the groove wall forming the engaging portions 9a, 9b on the split wheels 5a, 5b side and the engaging portions 10a, 10b on the cage 8 side. Has been. For this reason, during normal operation, the engaging portions 10a, 10b on the cage 8 side and the groove inner surface of the circumferential groove including the engaging portions 9a, 9b on the split wheels 5a, 5b side do not contact in the axial direction. .
Therefore, the rolling bearing according to the first embodiment can eliminate the risk of the intrusion of the friction powder or the like due to the contact of the engaging portions 9a, 9b, 10a, and 10b in the state where the bearing is incorporated.

In the rolling bearing according to the first embodiment, the cage 8 that does not have the retaining portion is employed, but a cage retainer with the retaining portion can also be employed. As an example, FIG. 5 shows a second embodiment of the present invention. In the following description, the description of the same configuration as in the first embodiment is omitted, the same configuration name is used, and differences are mainly described.
As shown in FIG. 5, the cage 50 of the rolling bearing according to the second embodiment includes claw-like retaining portions 53a and 53b protruding from the annular portions 52a and 52b at the opening edges of the pockets 51 on the inner ring 1 side. Is formed. The rolling elements 3 placed in the respective pockets 51 are pushed into the respective pockets 51 from the retaining portion side with the respective pockets 51 of the cage 50 facing the raceway surface of the outer ring 2 to prevent the retaining portions 53a. 53b can be elastically deformed to push the rolling element 3 into the pocket. When this operation is finished, the outer ring 2, the cage 50, and the rolling elements 3, 3,. The two split rings can be abutted against the rolling elements 3, 3,... Of the raceway assembly. In the rolling bearing according to the second embodiment, since the rolling elements 3, 3,... Are prevented from being detached, the direction of the bearing central axis when the divided wheels are relatively approached can be freely set. The split wheels can be relatively approached with the direction oriented horizontally.

In the rolling bearing according to the first embodiment or the like, the split ends of the two split rings 5a and 5b are abutted in the state where the inner ring 1 is configured, but preload is applied in the axial direction in a state where the bearing is incorporated. For this reason, it is also possible to form a gap in the axial direction between the split rings of the inner ring. As an example, FIG. 6 shows a third embodiment of the present invention.
As shown in FIG. 6, in the inner ring 60 of the rolling bearing according to the third embodiment, the split ends 62a and 62b of the split rings 61a and 61b have a gap in the axial direction. Even if there is such a gap, the split wheels 61a, 61b are not displaced in the radial direction and the axial direction toward the center of the bearing width due to contact with the rolling elements 3, 3 ... on the raceway surface of the outer ring 2. It is limited and there is no hindrance to the separation stop.

In the rolling bearing according to the first embodiment and the like, the inner ring 1 is a raceway ring and the outer ring 2 is a non-separable type. However, if the inner and outer diameter relations are considered in reverse, the outer ring is similarly prevented from being separated. be able to. As an example, FIG. 7 shows a fourth embodiment of the present invention.
As shown in FIG. 7, in the rolling bearing according to the fourth embodiment, the inner ring 71 is a non-separating type, and the outer ring 72 is a mating race formed by two divided rings 73a and 73b. The engaging portion of the retainer 74 is provided on the outer diameter surface, and the engaging portions of the split wheels 73a and 73b are provided on the inner diameter surface.

In the rolling bearing according to the first embodiment and the like, a four-point contact ball bearing is illustrated, but the present invention can be similarly applied to other multi-point contact ball bearings such as a three-point contact ball bearing. In addition, as with NUP type and NH type cylindrical roller bearings, one of the bearing rings can be applied to a roller bearing including a collar ring and a split ring with a single collar on which a raceway surface is formed. . For example, in the case of an NUP type cylindrical roller bearing, the collar ring can be positioned in the radial direction by radial contact with the cage. In the case of an NH-shaped cylindrical roller bearing, the L-shaped collar ring can be positioned in the radial direction by fitting with a split ring with one collar. Therefore, even if the collar ring cannot be positioned in the radial direction by the rolling element set as in the case of the NH type or NUP type cylindrical roller bearing, the engagement between the cage engaging part and the collar ring engaging part is possible. Thus, the collar ring and the split ring with one collar can be separated and stopped.
In the case of a cylindrical roller bearing, the collar ring and the split collar with one collar may be simultaneously pressed against the engaging portion of the cage. This is because the rolling element can be received in the radial direction only by the split ring with one collar.
In the case of an L-shaped collar ring, the protrusion that constitutes the engaging portion of the cage can be restricted at an inclination with respect to the radial direction by the above-described fitting, and therefore may be at one place in the circumferential direction.

Longitudinal half sectional view showing an axial section of the rolling bearing according to the first embodiment a is a side view of the cage shown in FIG. 1, and b is a sectional view taken along line IIb-IIb of a. a is an action diagram showing the assembly process constituting the inner ring of FIG. 1 from a cross section cut by an axial plane, and b is an action diagram showing a state in which the engaging portion of the cage gets over the split wheel from the state of a. Fig. 1 is a view showing the state in which the rolling bearing of Fig. 1 is assembled between the housing and the shaft in an axial section. Longitudinal half sectional view showing axial section of rolling bearing according to second embodiment Vertical half sectional view showing an axial cross section of a rolling bearing according to a third embodiment Longitudinal half sectional view showing axial section of rolling bearing according to fourth embodiment

Explanation of symbols

1, 60, 71 Inner ring 2, 72 Outer ring 3 Rolling element 4, 15 Raceway surface 5a, 5b, 61a, 61b, 73a, 73b Split ring 6a, 6b Single side 7a, 7b Single shoulder 8, 50, 74 Cage 9a, 9b, 10a, 10b Engagement part 11a, 11b, 52a, 52b Annular part 12 Pillar part 13, 51 Pocket 14a, 14b Cage guide surface

Claims (8)

  An inner ring, an outer ring, and a plurality of rolling elements interposed between the raceways of the inner and outer rings and held by a cage. One of the inner and outer rings sandwiches the rolling elements in a cage pocket from both sides in the axial direction. In a rolling bearing comprising two split rings that are brought into contact with the raceway surface, and separating the two split rings so that the rolling elements do not fall off, the two split rings are axially engaged with the cage. A rolling bearing comprising: an engagement portion that is separable and fixed, and that can be engaged with a cage; and an engagement portion that can be engaged with a split ring.   The engagement portion of the split ring is formed on a radial surface facing the cage, and the engagement portion of the cage is formed on a radial surface facing the one track ring. The rolling bearing described.   One of the engaging portion of the cage and the engaging portion of the split ring is a convex portion, and the other is formed such that the convex portion is hooked in the axial direction, and the split ring is axially attached to the rolling element. 3. The rolling according to claim 1, wherein the one engaging portion is pushed away by the counterpart component while approaching from one side, and is then hooked to the other engaging portion by elastic recovery. 4. bearing.   The engaging portion of the cage is the convex portion, a tapered surface is formed on one side surface in the axial direction of the convex portion, and the dividing ring is pressed against the tapered surface to move the cage away from the radial direction. The rolling bearing according to claim 3, wherein a component force is generated.   The said one engaging part was partially formed in the circumferential direction around an axis | shaft, and said other engaging part was formed over the circumferential direction perimeter. Rolling bearing.   The cage is a raceway guide system using the other raceway of the inner and outer races, and has a cage shape without a part for preventing the rolling element from coming off to the one raceway side, and The other raceway of the ring is arranged so that the central axis thereof is directed in the vertical direction, the cage is concentric with the other raceway, and each pocket is on the raceway surface of the other raceway. The rolling elements placed in the respective pockets are arranged so as to face each other and are received by the raceway surface of the other raceway ring and the lower annular portion of the cage so as to remain in the pockets. When the split wheels are concentric with the cage and are arranged above and below the rolling elements in the respective pockets, and when the split wheels are brought relatively close to each other, the one engaging portion comes into contact with the counterpart component. Previously, these split wheels approached to the position where the rolling elements cannot pass Rolling bearing according to any one of claims 3 to 5, characterized in that the so that.   The engaging portion of the cage and the engaging portion of the split ring are capable of relative rotation in a non-contact manner in a state where the bearing is incorporated, and are engaged regardless of the relative rotational position of each other. The rolling bearing according to any one of claims 1 to 6.   The cage is a bearing ring guide system, and the cage guide surface of the race ring, the engaging portion of the cage and the split ring are arranged on the same radial plane, and the annular portion of the cage and the cage guide The radial guide clearance between the surfaces is smaller than the radial clearance between the engagement portion of the split ring and the engagement portion of the cage, and the axial pocket clearance of the cage is the engagement portion of the split wheel. The rolling bearing according to claim 7, wherein the rolling bearing is smaller than an axial gap between engaging portions of the cage.

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